# a = [10, 20, 30]
# b = [10, 20, 30]
#
# print(a == b)  # True, 判断两个内容的值是否一致
# print(a is b)  # False, 判断两个内容的内存地址是否一致
#
# print(id(a))
# print(id(b))
#
# # 一般我们用is来判空
# c = None
# if c is None:
#     print("c是空")
# else:
#     print("c不是空")
#

